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He could have ulcers in the stomach due to the stress from the surgery. He should have upper GI endoscopy.
He could have postcholecystectomy syndrome (PCS) which is a complex of heterogeneous symptoms, including persistent abdominal pain and dyspepsia, that recur and persist after cholecystectomy. He should have ultrasound and/or computed tomography (CT) scanning followed by direct cholangiography or magnetic resonance cholangiopancreatography (MRCP) to to look for retained or recurrent stones or identify a bile duct leak, stricture, or transection.